Automatic system for high-speed pulse measurement of specific heat, resistivity, and integral emissivity for refractory materials

1985 ◽  
Vol 28 (11) ◽  
pp. 1012-1015
Author(s):  
I. I. Petrova ◽  
V. Ya. Chekhovskoi ◽  
A. N. Kolesnichenko ◽  
A. I. Samsonov
Keyword(s):  
Specific Heat ◽  
Automatic System ◽  
High Speed ◽  
Refractory Materials ◽  
Pulse Measurement ◽  
Integral Emissivity

Increasing the mobility of a high-speed tracked vehicle based on a controlled skid algorithm

2020 ◽  
pp. 29-33
Author(s):  
S. V. Kondakov ◽  
O.O. Pavlovskaya ◽  
I.D. Ivanov ◽  
A.R. Ishbulatov
Keyword(s):  
Mathematical Model ◽  
Dynamic Stability ◽  
Simulation Modeling ◽  
Automatic System ◽  
High Speed ◽  
Control Algorithm ◽  
Loss Of Stability ◽  
Tracked Vehicle ◽  
Hydrostatic Transmission ◽  
The Mathematical Model

A method for controlling the curvilinear movement of a high-speed tracked vehicle in a skid without loss of stability is proposed. The mathematical model of the vehicle is refined. With the help of simulation modeling, a control algorithm is worked out when driving in a skid. The effectiveness of vehicle steering at high speed outside the skid is shown. Keywords: controlled skid, dynamic stability, steering pole displacement, hydrostatic transmission, automatic system, fuel supply. [email protected]

scholarly journals The high-speed after-pulse measurement system for PMT

2018 ◽  
Vol 13 (05) ◽  
pp. P05014-P05014 ◽  
Author(s):  
Y. Cheng ◽  
S. Qian ◽  
Z. Ning ◽  
J. Xia ◽  
Z. Wang
Keyword(s):  
Measurement System ◽  
High Speed ◽  
Pulse Measurement

Finite Element Investigation of the Influence of Thermophysical Parameters on Segmented Chip Formation during High Speed Cutting

2011 ◽  
Vol 130-134 ◽  
pp. 2817-2821
Author(s):  
You Xi Lin ◽  
Cong Ming Yan
Keyword(s):  
Thermal Conductivity ◽  
Finite Element ◽  
Specific Heat ◽  
Chip Formation ◽  
High Speed ◽  
Element Model ◽  
Serrated Chip ◽  
High Speed Cutting ◽  
Thermophysical Parameters ◽  
Serrated Chip Formation

A 2D fully thermal mechanical coupled finite element model is applied to study the influence of material parameters on serrate chip formation during high speed cutting process. The serrated chip formation during high speed machining was predicted. Of interests are the effects of thermal conductivity, specific heat and density. Results showed significant influence of these thermophysical parameters on the serrated chip phenomena, especially in the case of the density. Increasing thermal conductivity specific heat and density lead to a decreasing degree of segmentation. The influence of the thermal conductivity on the cutting force and the specific heat on maximum temperatures in the shear band is also discussed.

scholarly journals Research of heating the lining of high-temperature units in order to increase their residual resource

2021 ◽  
Vol 135 (2) ◽  
pp. 116-122
Author(s):  
A.S. Nikiforov ◽  
◽  
A.E. Karmanov ◽  
E.V. Prikhod’ko ◽  
A.K. Kinzhibekova ◽  
...  
Keyword(s):  
High Temperature ◽  
Ultimate Strength ◽  
High Speed ◽  
Mechanical Stresses ◽  
Heating Process ◽  
Refractory Materials ◽  
Initial Stage

The article contains an analysis of the initial stage of the heating process of high-temperature units. The heating modes used at the enterprises lead to various difficulties: a delay in the heating process or heating at a high speed at which mechanical stresses arise and exceed the permissible values. The proposed graphical dependencies for heating allow us to heat up at the highest possible speeds, taking into account the time spent on drying. In this case, the ultimate strength of refractory materials is not exceeded, which leads to a significant reduction in the time for the heating process.

scholarly journals The so-called thermoid effect and the question of superheating of a plantinum-silver resistance used in continuous-flow calorimetry

1912 ◽  
Vol 86 (587) ◽  
pp. 330-332 ◽  
Keyword(s):  
Specific Heat ◽  
Continuous Flow ◽  
High Speed ◽  
Electric Heating ◽  
Flow Calorimeter ◽  
Heating Current ◽  
Liquid Moving ◽  
Absolute Measurements ◽  
Good Agreement ◽  
Made In

In a recent paper by Glazebrook, Bousfield, and Smith some doubt has been east on the accuracy of my absolute measurements of the specific heat of water by the continuous-flow calorimeter. It is stated that an error of as much as 6 parts in 10,000 might have occurred in the superheating of the oil-stirred platinurn-silver resistances from which the values of the electric heating current were obtained. On the other band, it is also stated that this error might have been as small as 2.5 parts in 10,000. It was with some surprise that I read this statement, inasmuch as the authors could not have been aware of the rapidity of oil circulation which I used. It has been shown by Osborne Reynolds and others that the heat loss from a surface immersed in a liquid moving in turbulent motion is directly proportional to the velocity of flow. The degree of superheating of a wire immersed in oil will depend then directly on the rate of circulation, bully realising this fact, the resistances which I used were designed by Prof. Callendar and myself to be immersed in oil which could be circulated with great rapidity, These resistances are described in our papers, where the illustration shows approximately to scale the relative sizes of the stirrer and resistances. The paddle was rotated at a high speed by a powerful water motor, and the oil was thrown down with such force that a considerable depression was made in the surface. The oil, thrown sideways, passed up around the bars wires, which were wound loosely on the mica frames. I do not know by what standard Glazebrook, Bousfield, and Smith decide what is "normal stirring" or "very vigorous stirring," but it was evident to me at ones that I must have bad much more rapid circulation than anything used by these authors. In testing the accuracy of my experiments special attention was taken of possible superheating, and tests of stirring were made at the time. The good agreement of the various determinations of the specific heat, made with such different values for the heating current and flow of water, make evident that no large superheating error could have existed without being detected.

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